Fluid Conductivity of Porous Aluminum Fabricated by Powder-Metallurgical Spacer Method

Abstract

Porous aluminum with well-adjusted porosity and pore size was fabricated by a powder-metallurgical spacer method, and its fluid conductivity was investigated. As the porosity and pore size increased, the Darcian permeability increased. However, the permeability of the porous aluminum was significantly lower than the expected value based on those of other similar porous materials. The low fluid conductivity is attributed to the presence of small apertures at cell walls, which is peculiar to the porous metals fabricated by the powder-metallurgical spacer method.

Sound absorption characteristics of porous aluminum fabricated by spacer method

“…4 Recently, the importance of aperture size in the flow resistance of porous metals has been emphasized. 16,17 Porous Al produced by the spacer method has apertures connecting contiguous cells, through which the sound wave travels between cells ͑Fig. 2͒.…”

Effects of Pore Characteristics Finely-Controlled by Spacer Method on Damping Capacity of Porous Aluminum

“…Hence, porous metals fabricated by the spacer method have been used for investigations of the effects of the porosity and pore size on various properties of porous metals. [20][21][22] Also, small pore sizes of approximately 100 mm can be attained by the spacer method. [14][15][16][17][18][19] In the present study, porous Al specimens with porosities ranging from 55.7 to 68.2% and pore sizes ranging from 53-106 to 425-500 mm are fabricated by the spacer method, and the damping capacity is examined in order to understand the effect of the porosity and pore size.…”